4 X 120GB EVO Vs 3 EVO's with a WD Green 120GB

[Pedro_The_Swift]

RAID 0...

[BradC]

I can't do anything other than a read benchmark on these as they are all in service. Write is a bit slower, but not much.

3 of these drives have been in use for a few years :


/dev/sds - INTEL SSDSC2KW256G8 - 0 years 124 days 5 hours
/dev/sdd - INTEL SSDSC2CT240A3 - 5 years 278 days 8 hours
/dev/sdt - INTEL SSDSC2CT240A3 - 5 years 279 days 18 hours
/dev/sdc - INTEL SSDSC2CT240A3 - 5 years 294 days 13 hours


Oddly enough all 3 of the 330s (240A3) have been in service and switched on for exactly the same period of time, they just have varying levels of clock drift.

The 4th is a year or so old but it has a firmware bug where the hour counter increments at 1/4 of the real time.



srv:/home/brad# grep ^md5 /proc/mdstat
md5 : active raid0 sdc[0] sds[3] sdt[2] sdd[1]
srv:/home/brad# for i in /dev/sd[cdst] ; do smartctl -i $i | grep "Device Model" ; done
Device Model: INTEL SSDSC2CT240A3
Device Model: INTEL SSDSC2CT240A3
Device Model: INTEL SSDSC2KW256G8
Device Model: INTEL SSDSC2CT240A3




srv:~# dd if=/dev/md5 bs=1M of=/dev/null
930495+1 records in
930495+1 records out
975695249408 bytes (976 GB) copied, 525.909 s, 1.9 GB/s


For reference, here's a RAID 6 of 8 6TB WD Red drives in the same machine. That's about the equivalent of a RAID 0 of 6 drives. They're not as fast as the 14 x 2TB drives they replaced, but they still saturate the 4 bonded GB network links. Need to upgrade to 10G nics.



srv:/home/brad# dd if=/dev/md0 bs=1G count=128 of=/dev/null
128+0 records in
128+0 records out
137438953472 bytes (137 GB) copied, 270.585 s, 508 MB/s